mirror of https://gitee.com/bigwinds/arangodb
552 lines
20 KiB
C++
552 lines
20 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// DISCLAIMER
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///
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/// Copyright 2014-2016 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGOD_VOC_BASE_DATAFILE_H
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#define ARANGOD_VOC_BASE_DATAFILE_H 1
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#include "Basics/Common.h"
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#include "VocBase/vocbase.h"
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struct TRI_datafile_t;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Datafiles
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///
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/// All data is stored in datafiles. A set of datafiles forms a collection.
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/// In the following sections the internal structure of a datafile is
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/// described.
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///
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/// A datafile itself is a collection of blobs. These blobs can be shaped
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/// JSON documents or any other information. All blobs have a header field,
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/// call marker followed by the data of the blob itself.
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///
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/// @section DatafileMarker Datafile Marker
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///
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/// @copydetails TRI_df_marker_t
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///
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/// @copydetails TRI_df_header_marker_t
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///
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/// @copydetails TRI_df_footer_marker_t
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///
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/// A datafile is therefore structured as follows:
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///
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/// <table border>
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/// <tr>
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/// <td>TRI_df_header_marker_t</td>
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/// <td>header entry</td>
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/// </tr>
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/// <tr>
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/// <td>...</td>
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/// <td>data entry</td>
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/// </tr>
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/// <tr>
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/// <td>...</td>
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/// <td>data entry</td>
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/// </tr>
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/// <tr>
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/// <td>...</td>
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/// <td>data entry</td>
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/// </tr>
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/// <tr>
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/// <td>...</td>
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/// <td>data entry</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_df_footer_marker_t</td>
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/// <td>footer entry</td>
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/// </tr>
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/// </table>
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///
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/// @section WorkingWithDatafile Working With Datafiles
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///
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/// A datafile is created using the function @ref TRI_CreateDatafile.
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///
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/// @copydetails TRI_CreateDatafile
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile version
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////////////////////////////////////////////////////////////////////////////////
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#define TRI_DF_VERSION (2)
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////////////////////////////////////////////////////////////////////////////////
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/// @brief maximum size of a single marker (in bytes)
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////////////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////////////
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/// @brief state of the datafile
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////////////////////////////////////////////////////////////////////////////////
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enum TRI_df_state_e {
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TRI_DF_STATE_CLOSED = 1, // datafile is closed
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TRI_DF_STATE_READ = 2, // datafile is opened read only
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TRI_DF_STATE_WRITE = 3, // datafile is opened read/append
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TRI_DF_STATE_OPEN_ERROR = 4, // an error has occurred while opening
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TRI_DF_STATE_WRITE_ERROR = 5, // an error has occurred while writing
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TRI_DF_STATE_RENAME_ERROR = 6 // an error has occurred while renaming
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief type of the marker
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////////////////////////////////////////////////////////////////////////////////
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enum TRI_df_marker_type_t : uint8_t {
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TRI_DF_MARKER_MIN = 9, // not a real marker type,
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// but used for bounds checking
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TRI_DF_MARKER_HEADER = 10,
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TRI_DF_MARKER_FOOTER = 11,
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TRI_DF_MARKER_BLANK = 12,
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TRI_DF_MARKER_COL_HEADER = 20,
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TRI_DF_MARKER_PROLOGUE = 25,
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TRI_DF_MARKER_VPACK_DOCUMENT = 30,
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TRI_DF_MARKER_VPACK_REMOVE = 31,
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TRI_DF_MARKER_VPACK_CREATE_COLLECTION = 40,
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TRI_DF_MARKER_VPACK_DROP_COLLECTION = 41,
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TRI_DF_MARKER_VPACK_RENAME_COLLECTION = 42,
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TRI_DF_MARKER_VPACK_CHANGE_COLLECTION = 43,
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TRI_DF_MARKER_VPACK_CREATE_INDEX = 50,
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TRI_DF_MARKER_VPACK_DROP_INDEX = 51,
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TRI_DF_MARKER_VPACK_CREATE_DATABASE = 60,
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TRI_DF_MARKER_VPACK_DROP_DATABASE = 61,
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TRI_DF_MARKER_VPACK_BEGIN_TRANSACTION = 70,
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TRI_DF_MARKER_VPACK_COMMIT_TRANSACTION = 71,
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TRI_DF_MARKER_VPACK_ABORT_TRANSACTION = 72,
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TRI_DF_MARKER_MAX // again, this is not a real
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// marker, but we use it for
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// bounds checking
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile version
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////////////////////////////////////////////////////////////////////////////////
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typedef uint32_t TRI_df_version_t;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_datafile_t {
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TRI_voc_fid_t _fid; // datafile identifier
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TRI_df_state_e _state; // state of the datafile (READ or WRITE)
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int _fd; // underlying file descriptor
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void* _mmHandle; // underlying memory map object handle (windows only)
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TRI_voc_size_t _initSize; // initial size of the datafile (constant)
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TRI_voc_size_t _maximalSize; // maximal size of the datafile (adjusted
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// (=reduced) at runtime)
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TRI_voc_size_t _currentSize; // current size of the datafile
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TRI_voc_size_t _footerSize; // size of the final footer
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char* _data; // start of the data array
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char* _next; // end of the current data
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TRI_voc_tick_t _tickMin; // minimum tick value contained
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TRI_voc_tick_t _tickMax; // maximum tick value contained
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TRI_voc_tick_t _dataMin; // minimum tick value of document/edge marker
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TRI_voc_tick_t _dataMax; // maximum tick value of document/edge marker
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char* _filename; // underlying filename
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// function pointers
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bool (*isPhysical)(struct TRI_datafile_t const*); // returns true if
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// the datafile is a
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// physical file
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char const* (*getName)(
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struct TRI_datafile_t const*); // returns the name of a datafile
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void (*close)(struct TRI_datafile_t*); // close the datafile
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void (*destroy)(struct TRI_datafile_t*); // destroys the datafile
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bool (*sync)(struct TRI_datafile_t*, char const*,
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char const*); // syncs the datafile
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int _lastError; // last (critical) error
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bool _full; // at least one request was rejected because there is not enough
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// room
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bool _isSealed; // true, if footer has been written
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// .............................................................................
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// access to the following attributes must be protected by a _lock
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// .............................................................................
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char* _synced; // currently synced upto, not including
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char* _written; // currently written upto, not including
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile marker
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///
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/// All blobs of a datafile start with a header. The base structure for all
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/// such headers is as follows:
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///
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/// <table border>
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/// <tr>
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/// <td>TRI_voc_size_t</td>
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/// <td>_size</td>
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/// <td>The total size of the blob. This includes the size of the the
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/// marker and the data. In order to iterate through the datafile
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/// you can read the TRI_voc_size_t entry _size and skip the next
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/// _size - sizeof(TRI_voc_size_t) bytes.</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_voc_crc_t</td>
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/// <td>_crc</td>
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/// <td>A crc of the marker and the data. The zero is computed as if
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/// the field _crc is equal to 0.</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_df_marker_type_t</td>
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/// <td>_type</td>
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/// <td>see @ref TRI_df_marker_type_t</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_voc_tick_t</td>
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/// <td>_tick</td>
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/// <td>A unique identifier of the current blob. The identifier is
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/// unique within all datafiles of all collections. See
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/// @ref TRI_voc_tick_t for details.</td>
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/// </tr>
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/// </table>
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///
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/// Note that the order is important: _size must be the first entry
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/// and _crc the second.
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_df_marker_t {
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private:
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TRI_voc_size_t _size; // 4 bytes
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TRI_voc_crc_t _crc; // 4 bytes, generated
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uint64_t _typeAndTick; // 8 bytes, including 1 byte for type and 7 bytes for tick
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public:
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TRI_df_marker_t() : _size(0), _crc(0), _typeAndTick(0) {}
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~TRI_df_marker_t() {}
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inline off_t offsetOfSize() const noexcept {
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return offsetof(TRI_df_marker_t, _size);
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}
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inline off_t offsetOfCrc() const noexcept {
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return offsetof(TRI_df_marker_t, _crc);
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}
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inline off_t offsetOfTypeAndTick() const noexcept {
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return offsetof(TRI_df_marker_t, _typeAndTick);
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}
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inline TRI_voc_size_t getSize() const noexcept { return _size; }
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inline void setSize(TRI_voc_size_t size) noexcept { _size = size; }
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inline TRI_voc_crc_t getCrc() const noexcept { return _crc; }
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inline void setCrc(TRI_voc_crc_t crc) noexcept { _crc = crc; }
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inline TRI_voc_tick_t getTick() const noexcept {
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return static_cast<TRI_voc_tick_t>(_typeAndTick & 0x00ffffffffffffffULL);
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}
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inline void setTick(TRI_voc_tick_t tick) noexcept {
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_typeAndTick &= 0xff00000000000000ULL;
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_typeAndTick |= tick;
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}
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inline TRI_df_marker_type_t getType() const noexcept {
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return static_cast<TRI_df_marker_type_t>((_typeAndTick & 0xff00000000000000ULL) >> 56);
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}
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inline void setType(TRI_df_marker_type_t type) noexcept {
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uint64_t t = static_cast<uint64_t>(type) << 56;
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_typeAndTick &= 0x00ffffffffffffffULL;
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_typeAndTick |= t;
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}
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inline void setTypeAndTick(TRI_df_marker_type_t type, TRI_voc_tick_t tick) noexcept {
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uint64_t t = static_cast<uint64_t>(type) << 56;
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t |= (tick & 0x00ffffffffffffffULL);
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_typeAndTick = t;
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}
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};
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static_assert(sizeof(TRI_df_marker_t) == 16, "invalid size for TRI_df_marker_t");
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile header marker
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///
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/// The first blob entry in a datafile is always a TRI_df_header_marker_t.
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/// The header marker contains the version number of the datafile, its
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/// maximal size and the creation time. There is no data payload.
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///
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/// <table border>
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/// <tr>
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/// <td>TRI_df_version_t</td>
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/// <td>_version</td>
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/// <td>The version of a datafile, see @ref TRI_df_version_t.</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_voc_size_t</td>
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/// <td>_maximalSize</td>
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/// <td>The maximal size to which a datafile can grow. If you
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/// attempt to add more datafile to a datafile, then an
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/// error TRI_ERROR_ARANGO_DATAFILE_FULL is returned.</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_voc_tick_t</td>
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/// <td>_fid</td>
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/// <td>The creation time of the datafile. This time is different
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/// from the creation time of the blob entry stored in
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/// base._tick.</td>
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/// </tr>
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/// </table>
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_df_header_marker_t {
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TRI_df_marker_t base; // 16 bytes
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TRI_df_version_t _version; // 4 bytes
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TRI_voc_size_t _maximalSize; // 4 bytes
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TRI_voc_tick_t _fid; // 8 bytes
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile footer marker
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_df_prologue_marker_t {
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TRI_df_marker_t base; // 16 bytes
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TRI_voc_tick_t _databaseId; // 8 bytes
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TRI_voc_cid_t _collectionId; // 8 bytes
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief datafile footer marker
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///
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/// The last entry in a full datafile is always a TRI_df_footer_marker_t.
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/// The footer contains the maximal size of the datafile and it total
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/// size.
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///
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/// <table border>
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/// <tr>
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/// <td>TRI_voc_size_t</td>
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/// <td>_maximalSize</td>
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/// <td>The maximal size to which a datafile can grow. This should match
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/// the maximal stored in the @ref TRI_df_header_marker_t.</td>
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/// </tr>
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/// <tr>
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/// <td>TRI_voc_size_t</td>
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/// <td>_totalSize</td>
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/// <td>The real size of the datafile. Should always be less than or equal
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/// to the _maximalSize.</td>
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/// </tr>
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/// </table>
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///
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/// It is not possible to append entries after a footer. A datafile which
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/// contains a footer is sealed and read-only.
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_df_footer_marker_t {
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TRI_df_marker_t base; // 16 bytes
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief document datafile header marker
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////////////////////////////////////////////////////////////////////////////////
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struct TRI_col_header_marker_t {
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TRI_df_marker_t base; // 16 bytes
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TRI_voc_cid_t _cid; // 8 bytes
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};
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////////////////////////////////////////////////////////////////////////////////
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/// @brief creates a new datafile
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///
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/// This either creates a datafile using TRI_CreateAnonymousDatafile or
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/// ref TRI_CreatePhysicalDatafile, based on the first parameter
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////////////////////////////////////////////////////////////////////////////////
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TRI_datafile_t* TRI_CreateDatafile(char const*, TRI_voc_fid_t fid,
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TRI_voc_size_t, bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief frees the memory allocated, but does not free the pointer
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////////////////////////////////////////////////////////////////////////////////
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void TRI_DestroyDatafile(TRI_datafile_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief frees the memory allocated and but frees the pointer
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////////////////////////////////////////////////////////////////////////////////
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void TRI_FreeDatafile(TRI_datafile_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief returns the name for a marker
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////////////////////////////////////////////////////////////////////////////////
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char const* TRI_NameMarkerDatafile(TRI_df_marker_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief checks whether a marker is valid
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_IsValidMarkerDatafile(TRI_df_marker_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief reserves room for an element, advances the pointer
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////////////////////////////////////////////////////////////////////////////////
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int TRI_ReserveElementDatafile(
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TRI_datafile_t* datafile, TRI_voc_size_t size, TRI_df_marker_t** position,
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TRI_voc_size_t maximalJournalSize) TRI_WARN_UNUSED_RESULT;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief writes a marker to the datafile
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/// this function will write the marker as-is, without any CRC or tick updates
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////////////////////////////////////////////////////////////////////////////////
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int TRI_WriteElementDatafile(TRI_datafile_t* datafile, void* position,
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TRI_df_marker_t const* marker,
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bool sync) TRI_WARN_UNUSED_RESULT;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief checksums and writes a marker to the datafile
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////////////////////////////////////////////////////////////////////////////////
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int TRI_WriteCrcElementDatafile(TRI_datafile_t* datafile, void* position,
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TRI_df_marker_t* marker,
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bool sync) TRI_WARN_UNUSED_RESULT;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief update tick values for a datafile
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////////////////////////////////////////////////////////////////////////////////
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void TRI_UpdateTicksDatafile(TRI_datafile_t*, TRI_df_marker_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief iterates over a datafile
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/// also may set datafile's min/max tick values
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_IterateDatafile(TRI_datafile_t*,
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bool (*iterator)(TRI_df_marker_t const*, void*,
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TRI_datafile_t*),
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void* data);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief opens an existing datafile read-only
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////////////////////////////////////////////////////////////////////////////////
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TRI_datafile_t* TRI_OpenDatafile(char const*, bool);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief closes a datafile and all memory regions
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_CloseDatafile(TRI_datafile_t* datafile);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief seals a database, writes a footer, sets it to read-only
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////////////////////////////////////////////////////////////////////////////////
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int TRI_SealDatafile(TRI_datafile_t* datafile) TRI_WARN_UNUSED_RESULT;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief renames a datafile
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_RenameDatafile(TRI_datafile_t* datafile, char const* filename);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief truncates a datafile and seals it, only called by arango-dfdd
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////////////////////////////////////////////////////////////////////////////////
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int TRI_TruncateDatafile(char const* path, TRI_voc_size_t position);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief try to repair a datafile, only called by arango-dfdd
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////////////////////////////////////////////////////////////////////////////////
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bool TRI_TryRepairDatafile(char const* path);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief scan result entry
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///
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/// status:
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/// 1 - entry ok
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/// 2 - empty entry
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/// 3 - empty size
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/// 4 - size too small
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/// 5 - CRC failed
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////////////////////////////////////////////////////////////////////////////////
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struct DatafileScanEntry {
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DatafileScanEntry()
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: position(0), size(0), realSize(0), tick(0), type(TRI_DF_MARKER_MIN),
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status(0), typeName(nullptr) {}
|
|
|
|
~DatafileScanEntry() = default;
|
|
|
|
TRI_voc_size_t position;
|
|
TRI_voc_size_t size;
|
|
TRI_voc_size_t realSize;
|
|
TRI_voc_tick_t tick;
|
|
|
|
TRI_df_marker_type_t type;
|
|
uint32_t status;
|
|
|
|
char const* typeName;
|
|
std::string key;
|
|
std::string diagnosis;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief scan result
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
struct DatafileScan {
|
|
DatafileScan()
|
|
: currentSize(0), maximalSize(0), endPosition(0), numberMarkers(0),
|
|
status(1), isSealed(false) {
|
|
entries.reserve(2048);
|
|
}
|
|
|
|
TRI_voc_size_t currentSize;
|
|
TRI_voc_size_t maximalSize;
|
|
TRI_voc_size_t endPosition;
|
|
TRI_voc_size_t numberMarkers;
|
|
|
|
std::vector<DatafileScanEntry> entries;
|
|
|
|
uint32_t status;
|
|
bool isSealed;
|
|
};
|
|
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
/// @brief returns information about the datafile, only called by arango-dfdd
|
|
////////////////////////////////////////////////////////////////////////////////
|
|
|
|
DatafileScan TRI_ScanDatafile(char const* path);
|
|
|
|
#endif
|